Construction of concrete pavements



July 4, 1933. wl 5 EDGE 1,916,563

CONSTRUCTION OF CONCRETE PAVEMENTS Filed Dec. 14, 1928 5 Sheets-Sheet l INVENTOR A `uly 4, 1933. w, s. EDGE CONSTRUCTION OF CONCRETE PAVEMENTS Filed Dec. 14, 1928 3 Sheets-Sheet 2 July 4, 1933. W s. EDGE 1,916,563

. CONSTRUCTION OF CONCRETE PAVEMENTS Filed Deo. 14, 1928 3 Sheets-Sheet 3 INVENTOR Patented July 4, 1933 UMTED ,STATES `WALTER s. EDGE, O1r1 PITTSBURGH, rENNsYIQvA'NIA, AssIGNOR'TO NATIONAL STEEL EARRIC COMPANY, sYLvANIA or PITTSBURGH, PENNSYLVANIA, A CORPORATION orv RENN- OONSTRUCTION OE CONCRETE PAVEMENTS Appncaltiniea ncemberm, i928.' serial No.,326,117. Y

My invention relates to the construction ofl Concrete roadways and the like, and more 'particularly to an improved means for forming slots therein and installing asphalt or other joint material in the said slots.

One object of my invention is to provide a means and a' lmethod"whereby slots in concrete roadways or other pavements'may be accurately and quickly lformedor straightened. g

f Another object of my invention is to provide `a means and a method for inserting precast asphalt or other joint material into the said slots, or into plastic-concrete which does not contain a slot. Y

till another object of my invention is to simplify and improvefgenerally the formation of expansion oints in concrete. j

`While vthe procedure as hereinafter dev scribed :contemplates the forming Ofa slot in the concrete forthe reception of pre-cast joint material ofasphalt or the like, it willv be understood thatbythe use of the appara@ tus shown, such pre-castl material-can be s forced into the concrete, while the concrete is plastic, particularlyin those cases where the coarse aggregate has been displaced and only the `finer particlesV and grout remain in the vicinity'of the line ofthe joint. i i j Also, the invention is designed for use .in roadways wherein` partial-depth joints are employed to produce a weakened plane?, as well as in roadways where full depth joints are desired. y

strips have beeninserted in roadways, it has frequently'been the practice to employ in connection with said strips a sheet-metal chanel which embraces the upper edge vof the strip or straps of metal partially imbedded' in the sides of said strips', to stiften the` l-leretofore, where Apre-cast asphalt joint an end elevational view thereof; Fig. 3 is a vie-w taken on the line III-III of Fig. 2; Fig. 4 is a yview taken on 'the line `IVf--IV Of-.Fig l;`Figs. 5 and 6 are side and end elevational views, respectively, showing 'a modification Ofa portion of the apparatus Of-Figs. 1v to 4; Figs. 7 and 8 are sideand ycross sectional views respectivelyof another modification showing the manner in which thel cutter may be employed in Vconnection with theapparatus of F igs.. 1"to.4; Figs. 9 Y and=-10 arel side and end elevational views respectively, vshowing the manner iny which va cutter may be employed in connection with Figs. 11 and 12 areside and end elevational. views respectively, of a slot cutting or slot. straightening tool; Figs. 13 and 14 are side and end elevational views respectively', of a. tool for vforcingwthe plastic material into place in the concrete; Figs. 15 and Av16 are side and end elevational views respectively, showthe structure of Figs. 5 and 6;

ing a finishing tool for use on the concrete after the joint has been inserted; Fig. 17 is a cross sectional view showing the gage bar in vplace upon the concretev and before a slot'has `been formed yin the concrete; Fig. l18 is a similar view 'showing the slot-forming tool in place in the gage and in position to be moved through the concrete to form the slot; Fig. 19 shows the asphalt joint partiallyv 'inserted into the concrete; Fig. 2O shows the manner in' which vthe joint is forced into place in the concrete by the tool of Fig.' 13; Fig. 21 shows a manner in which the concrete adja'- cent to the line of the oint is finished by the smoothing tool of Fig. 15; Fig` 22 shows the joint in place'with all of the tools removed; Fig.v23 shows the completed road section with the protruding' portion vofthe joint of Fig. 22 cut away, and Fig. 24 shows the manner in which the concrete may be rounded off at th corners alongside the inserted joint. VReferring now to Figs. 1 to 4, I show a finishingbridge 25 which maybe of somewhat the usual form and whichis mounted upon side forms 26 that also serve asy tracks for the wheels 27 and-28 of the bridge.- The wheels 28 are provided with double flanges while the wheels 27 have'their treads Hat. UU

The parts thus far referred to may be of any well-known form.

Disposed parallel of the tracks or side frames 26, I provide a guide or gage that is mounted upon the bridgU 25 in parallelism with and above the Vline of the joint which it is desired to form in the concrete. This guide bar structure is composed of two angle bars 29 that are spaced apart a. distance slightly' greater t-han the thickness ofthe joint strip which it is desired to place in the roadway. The ends of the bars are supported from rods 30 whose lower ends eX- tend between and are secured to the angles 29, by bolts 31. The rods 30 entend throughv thefupper and. lower flanges of brackets 32 and are supported thereby for verticalsliding movement with respect tothe bridge.

The rods 30 are freely slidab'len thebrackets-32 tovpermit ofconveniently raising the guide 29 out of contact with the concrete, the guide normally resting lightly upon the concrete by reason of ,its weight. Vertical adjustment of theguide is effected by means'of nuts-threaded on the upper ends of the rods 30. V'Ihebrackets 32 are rigidly secured to theframework of the bridge by means of U- bolts 33 which embrace certain ofthe transverse bars ofthe framework.

In Figs. 5 and 6, I show a modification,

4wherein the guide bars` 29a are supported from the framework by brackets 32u1V that correspond to the brackets 32 of Fig. 4. In this form of apparatus, the bars 29a have hooks 35.which engage notches in transversely-extending bracketarms 36 that are in turn fastened to the brackets 32a. By this arrangement, the guide bars 29a can have slight vertical movement without ,disengagement of the hooks 35 from the slots in the bracket arms, and-upon further lifting movement of thefguidebars, they can be slid along the bracket arms 36 until they engage the stop pins37 whereupon the joint is exposed for performing the finishing operations thereon.

Thebrackets 32a have slots 38 which permit of theiry vertical adjustment on the bridge, the U-bolts 33 extending through said slots `andarou'nd certain of the frame members .of the bridge.

The procedure followedin placing joint material in the roadways with the apparatus of Figs. 1 to 6 is asfollows t-Assuming the concrete to be in a plastic condition, the finishing bridge is placed above that portion thereof into which it is desired to place the` jointmaterial with the gage 29 resting Vupon the plastic concrete as shown in Fig. 17. lA

cutting tool 40 (Figs. 11, 12 and 18) is then forced into the concrete and moved longitudinally of the guide 29, to form or open a slot for the reception of a strip 41 of asphalt or other suitable material'. Y

In case a slot has been previously formed in Vthe concrete, the tool 40, guided by the gage 29 serve to support the sides of thev strip 41 while it is being forced into thereoncrete. If the coarse aggregate of theV concrete has beendisplaced as shown in Fig. 19 below the lower edge of the strip 41, or the concrete is sufficiently soft, it is not necessary that aslot be actually present in the concrete in order to permit the insertion of the strip y41. y y

After the tool 42 has been removed and the gage 29 taken away, the finishing tool or float 43 is utilized as shown in Fig. 21 to iinishand smooth the concretesurfaces in the vicinity of the asphalt joint, the tool being shown as having a .Y groove for the reception of the protruding edge of the strip.

In cases where the strip 41 is set into the concrete with its upper edge iiush with the surface of the concrete, a quarter round tool may be employed to round olf and finish the corners of the concrete atV the sides of the strip, in a manner well-known in the art.

Referring now to Figs. 7 and 8, I show a structurewherein' a cutting or slot-forming wheel 44 is supported lfrom the bridge as is the gage 29 of Figs. 1 to 4. v As the/'bridge is moved forward, the cutter 44 cuts or opens up a groove in the concrete, thereby reducing the labor of installing the joint material. Thewide'horizontal flanges of the gage, contacting with lthe surface of the concrete, prevents the breaking up ofthe finished surface through Amovement of the cutter. f

In Figs.-9 and 10, I show a cutter blade or slot-opening member 45 that is secured to the lower ends of brackets 32?) which correspond to the brackets 32 of Figs. 5 and 6, the gage 29?) corresponding to the Vgage 29a. The blade 45 will serve to cut or open a slot during traveling movement of the bridge as in the case of the wheel 44, and also results in a saving in the labor of installation.

l/Vhile I have described the insertion of an asphalt strip, it `will be understood that the apparatus may be employed for the installation of various other joint materials such as card board, paper, felt, etc., either in short lengths or as continuous strips fed from a roll, which strips may be inserted into the concrete either by hand or bya tool.

I claim as my invention j 1. Apparatus for producing a joint in concrete, comprising a supporting framework to be positioned over a concrete surface, a guide member, and means forloosely supporting the said member upon the framework for vertically sliding movement to permit said meub'` ber to rest upon the concrete. c

2. Apparatus for producing a joint in con'- crete, comprising a'l supporting framework to be positioned over a concrete surface, a

guide member, meansv for loosely supporting tbe said member upon the framework for vertically sliding movement to permitsaid mem- O ber to rest upon the concrete, and means permitting lateral movement of said member upon its support when it has been raised a predetermined distance.

f 3. Apparatus for producing a joint in concrete comprising a supporting framework to 

